Welder



March 25, 1941 E. G. BEIDERMAN WELDER Filed March 30, 1956 n El m m ATTORNEY.

5f/mm? u www, me@ 0() Patented Mar. 25, 1941 UNITED STATES PATENT OFFICE WELDEB Application March 30, 1936, Serial No. 71,705

8Claims.

This invention relates to Welders. It has for its object an automatic device which prevents the electrodes from being withdrawn from the work until the current has been cut oir. It is true 5 that this result has been obtained in the past as, for instance, a starting of the operation of the machine sets a cam shaft in motion which goes the complete cycle oi operations before it is stopped. But so far as I know it is new to provide a fluid operated device to hold the apparatus to one complete cycle operation notwithstanding a release oi pressure on the trigger or other operation initiating device.

This non-beat Welder is especially valuable in automatic repeat welding for the operator may very well release the trigger right in the middle of a weld and were it not for the non-beat device anl incomplete weld would result and also arcing. By the use 'of the "non-beat" control, the welding goes on untilv the current is oil and the electrodes released in the customary way.

In the drawing:

Fig. 1 is a large longitudinal section oi the tool.

Fig. 2 is a diagrammatic view of a repeat Welder embodying the non-beat device.

I and 2 are the electrodes. l supported by the piston 3. Referring-to Fig. 2, it will be seen that when the trigger 4 is depressed it opens the poppet valve 5 against. the air stream. This air stream comes from the slide valve l, which is in a position in Fig. 2 to connect with the air supply. Air passes through the air line 1 to the non-bea cylinder 8 and the electrode cyl- 35 inder 9 and the contactor cylinder I0. 'I'he iluid pressure causes the non-beat" piston l2 to press against the trigger4 and hold the trigger and the valve open even when the operators nger is released from thetrigger. I'hee'ontactor piston I3 rises in its cylinder and forces the primary swifrrh I4 closed for a given length of time. This time depends on the inclination and length of the face of the cam I5, the air pressure and the size of the opening allowing the air to enter in the cylinder l0. When the cam I5 passes behind the roller i6, the spring I1 forces the switch open. Here the collar i 1a picks up the nuts It on the end of the valve shaft il. This moves the slide valve 2B to its uppermost position, in which position the passage 2l will register with the port 22. The air will then go into the electrode cylinder 9 in front of the piston I and the air will escape out of the contactor cylinder lll and the "non-beat cylinder l through the 55 conduit 'l back to the port 2l which port 0f the slide valve casing will now be open to the atmosphere.

As soon as the pressure is released behind the contactor piston I3, the spring 24 snaps the cam I by the switch arm which has a one-direction 5 movement finger 25 which allows the cam to snap by the switch without moving the switch. Collar l1 now strikes the nuts 28 and forces the slide valve 20 back to the position shown in Fig. 2. The pressure now closes the poppet valve 5 and 10 thrusts the trigger 4 back to its inoperative position.

It will be apparent that as long as the finger pressure is kept on the trigger 4 the valve 5 will remain open and consequently the cycle oi operations will be automatically repeated, in fact, they can be repeated so rapidly as to achieve 400 or more welds a minute. The welds can be made in such quick succession as to be practically a stitch weld; By regulating the speed of the exhaust in the contact cylinder the speed of the repeats can be altered; the faster the air gets out of the contact cylinder the faster the machine will repeat; the faster the air gets in the contact cylinder the less the welding time and conversely the slower the entering of the air the longer the welding time. However I make no claim inthis application to the contacting cylinder and timer or the regulation thereof, nor the repeat welding, nor the control of the repeats with the contactor piston and the slide valve. 'I'his last is the subject matter of a separate application No 58,916 iiled January 13, 1936.

What I claim is:

1. In a welding machine the combination of a pair of iluid operative electrodes, a fluid operated electric timing means, means for supplying electrical energy to the electrodes when the timer is on, a trigger for controlling the fluid pressure, and a non-beat device in the form 40 o1' an air cylinder and piston controlled by the electric timing means to keep the trigger in operative position until the timerthrows oil the current.

2. In a welding machine the combination of a pair of iluid operative electrodes, a uid operated electric timer, means for supplying energy to the electrodes when the timer is on, a t'rigger for controlling the iiuid pressure, a .non-beat" device in the form of a fluid-controlled member controlled by the timer and which keeps the the trigger in operative position until the timer throws oft the current, and a duid reversing valve automatically operated by the pressure for continuously repeating the welding operation CPI as long as the trigger is kept in operative position.

3. In a repeat Welder, the combination of a pair of electrodes, means for bringing the electrodes together and separating them, means for furnishing current and timing it in consonance with the closing of the electrodes, control means for initiating these operations, fluid-operated means coordinated with the timer for causing the continuous repetition of the welding operations and fluid-operated means operable with I the last mentioned repeat control and which assures a completion ofthe weld before operations are stopped notwithstanding the operators release of the control device.

4. In a welding machine the combination of a pair of fluid operative electrodes, an electrical timing means, means for supplying electrical energy to the electrodes when the timer is on, a trigger for controlling the uid pressure, and a non-beat device controlled bythe electrical timer and in the form of a uid operated device which keeps the trigger in operative position until the timer throws off the current.

5. In a welding machine, the combination of a pair of fluid operated electrodes, a iiuid operated electric timer, means for supplying electric energy to the electrodes when the timer is in the l on position, a trigger for controlling the iluid pressure leading both to the iiuid operated electrodes and the iiuid operated electric timer, a Iiuid operated reversing valve for automatically reversing the uid iiowing to the electrodes as long as the trigger isk held in the on position, whereby the tool continuously repeats as long as the trigger is held in the on position, and a fluid-operated non-beat device coordinated with the timer for holding the trigger in the on" position while the electric timer is positioned to supply the current to the electrodes.

6. In a welding machine, the combination of l a pair of nuid operated lelectrodes, an electric timer including a ii'uid operated actuating member, means for supplying electric energy to the electrodes when the timer is in the on position, a trigger for controlling the uid pressure leading both to the uid operated electrodes and the iluid operated electric timer, a fluid operated reversing valve for automatically reversing the iiuid owing to the electrodes as long as the trigger is held in the on position, whereby the tool continuously repeats as long as the trigger is held in the on position, a. iiuid .operated non-beat device for holding the trigger in the on" position while the electric timer is positioned to supply the current to the electrodes, and both the reversing valve and the non-beat device being operated by and controlled by the fluid operated memberof the timer.

7. In a repeat welding machine, the combination of a pair of electrodes, pneumatic means for reciprocating the electrodes and also involving a fluid reversing valve pneumatically controlled, an electric timer also repeatedly operated in properly timed relation with the electrodes, a iluid pressure supply and valve for keeping the machine operating and repeating in an on welding'cycle and an ofi cycle as long as the vvalve is held open, and a non-beat device tending to keep the valve held open at all times during said on cycle and releasing each time on the o" cycle to permit the closing of the said valve and discontinuance of operations after the operator releases the valve.

3. In a repeat welding machine, the combination of a pair of electrodes, pneumatic means for reciprocating the electrodes and also involving a fluid reversing valve pneumatically controlled, an electric timer also repeatedly operated in properly timed relation with the electrodes, a fluid pressure supply and valve for keeping the machine operating and repeating in an on welding cycle and 'an oil cycle as long as the said valve is held open, and a non-beat device in the form of a piston and connected means operated by the said uid pressure and tending to keep the valve held open at all times during the on cycle of the apparatus and releasing each time on the o cycle of the apparatus to permit the closing of the said valve and discontinuance of operations after the operator releases the valve.

EDWARD G. BEIDERMAN. 

